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Q:

how to remove or reset the service engine soon light? on 1998 Nissan Altima

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my nissan altima 1998 model is newly tuned up but the service engine soon light still appears.the light appears a day ago and we tuned up the engine right after.
(1) Answer
It does not mean the car needs a maintenance service, but there is an engine or emission control problem is registered into the engine control module, it has to be diagnosed by a diagnostic computer and repaired accordingly. After the repair the ECM's memory and adaptation has to be reset.

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